https://git.ruby-lang.org/ruby.git/commit/?id=14db635097

From 14db635097ef89a299531770ba8ed5800a58ab8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Tue, 12 Nov 2019 16:15:58 +0900
Subject: add NEWS about _1 as a local variable [ci skip]


diff --git a/NEWS b/NEWS
index fd17599..244d5ab 100644
--- a/NEWS
+++ b/NEWS
@@ -126,6 +126,11 @@ sufficient information, see the ChangeLog file or Redmine https://github.com/ruby/ruby/blob/trunk/NEWS#L126
 
     [1, 2, 10].map { _1.to_s(16) } #=> ["1", "2", "a"]
 
+  You can still define a local variable named _1 and so on, and that is honored when present, but renders warning.
+
+    _1 = 0
+    [1].each { p _1 } # prints 0 instead of 1, but also warns.
+
 ==== proc/lambda without block is deprecated
 
 * Proc.new and Kernel#proc with no block in a method called with a block is
-- 
cgit v0.10.2


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